Would someone be able to assist me in decoding this notation at the bottom of a Slovakian Railways timetable?

The notes to the Slovakian Railways timetable can be found here (scroll down to find the English translation).
I've been trying my best however I'm struggling somewhat but I think what it's trying to say is "Runs Saturday & Sunday to 21 June and from 5 September and 22 December to 5 January. From 27 June to 31 August runs daily"? Any advance on that translation?!

The notes to the Slovakian Railways timetable can be found here (scroll down to find the English translation).
I've been trying my best however I'm struggling somewhat but I think what it's trying to say is "Runs Saturday & Sunday to 21 June and from 5 September and 22 December to 5 January. From 27 June to 31 August runs daily"? Any advance on that translation?!
